Các câu hỏi tương tự
Tính
a) A= 1 - 4 - 7 - .......- 2017
b) B = 2 - 6 - 10 - .......- 2018
c) C = 1 - 5 + 9 - 13 + 17 - 21 + ........ - 2017
13 tháng 4 2023 lúc 20:15
Bài 1: Tính
a) -3/20 + -7/4
b) 6 2/3 - 4 2/3
c) -3/10 + 7/12
d) 35/-9 . 81/7
e) -2/5 - -3/4
f) 5/23 . 7/26 + 5/23 . 9/26
g) -3/12 : 4/15
h) 1 1/6 - 3 1/3
i) -2/5 . (-3) + 3/8 . 4/-10
j) -13/17 + (13/-21 + -4/17)
a) -5/11 + ( -6/11 + 1 )
b) -13/17 + ( 13/-21 + -4/17 )
c) -5/12 . 7/-17 . 9/-20
d) 13/17 . 4/-5 + 13/17 . -3/4
e) -5/7 . 2/11 + -5/7 . 9/11 + 5/7
f) -2/5 . (-6) + 3/4 . 4/-10
20 tháng 7 2023 lúc 12:35
bài 1. Tính
a) 7/-25 + -8/25 b) 6/13 + -15/39 c) 5/7 + 4/-14 d) -8/18 + -15/27
bài 2. Tính
a) 3/5 + -7/4 b) (-2) + -5/8 c) 1/8 + -5/9 d) 6/13 + -14/39 e) -18/24 + 15/21
Bài 1 Tính nhanh
a) -3/7 + 5/13 + 3/7
b) -5/21+-2/21+8/24
c) -5/11+(-6/11+2)
d) (-1/32+1/2)+15/32
e)5/17+ -6/13 + 3/4 + 7/-13+12/17
f) 7/23+-18/18+-4/9+16/23+-5/8
g)1/3+-3/4+3/5+-1/36+1/15+-2/9
h)-1/2+1/3+-1/4+-2/8+4/18+4/9
bài 3 thực hiện phép tínhadfrac{5}{8}+dfrac{3}{17}+dfrac{4}{18}+dfrac{20}{-17}+dfrac{-2}{9}+dfrac{21}{56}bleft(dfrac{9}{16}+dfrac{8}{-27}right)+left(1+dfrac{7}{16}+dfrac{-19}{27}right)cleft(dfrac{13}{5}+dfrac{7}{16}right)+left(dfrac{-15}{16}+dfrac{6}{15}right) d left(6-2dfrac{4}{5}right).3dfrac{1}{8}-1dfrac{3}{5}:dfrac{1}{4}
Đọc tiếp
bài 3 thực hiện phép tính
a\(\dfrac{5}{8}+\dfrac{3}{17}+\dfrac{4}{18}+\dfrac{20}{-17}+\dfrac{-2}{9}+\dfrac{21}{56}\)
b\(\left(\dfrac{9}{16}+\dfrac{8}{-27}\right)+\left(1+\dfrac{7}{16}+\dfrac{-19}{27}\right)\)
c\(\left(\dfrac{13}{5}+\dfrac{7}{16}\right)+\left(\dfrac{-15}{16}+\dfrac{6}{15}\right)\) d \(\left(6-2\dfrac{4}{5}\right).3\dfrac{1}{8}-1\dfrac{3}{5}:\dfrac{1}{4}\)
18 tháng 2 2023 lúc 11:49
Tính hợp lý:
A= 21.\(10^2\)-11.100+90.\(10^2\)+\(2^2\).\(5^2\).125.16
B= \(\dfrac{5.4^{15}.9^9-4.3^{20}.8^9}{5.2^9.6^{19}-7.2^{29}.27^6}\)
C= 3+5-7-9+11+13 -13-17+19+...+2013-2015-2017+2019+2020
Tìm a , biết
a,-7×(5-a)-2×(a-10)=-15
b,-7×(5-a)-2×(a-10)=15
Tính tổng
a, A =1-2+3-4+5-6+...+2005-2006
b,B=1-4+7-10+...+331-334
c,C= 1-3+5-7+...+2001-2003
d,D=-9+13-17+21-...-81+85
4.24.5^2-(3^3.18+3^3.12)
31.15.7^2.4-31.49.40
1+2+3+4+5+6+7+8+9+10
1+3+5+7+9+11+13+15+19
2+6+10+14+22+23+26+34
5+8+11+14+17+20+23+26+29
1+6+11+16+21+26+31+36+41+47+51
10+13+16+19+22+25+28+31+34+37+40
5+7+9+11+13+15+17+3+8+13+18+23+28
4+7+10+13+16+19+5+9+13+17+21+25